Understanding Acceleration

Acceleration is the rate at which an object's velocity changes over time. It's calculated using the following formula:

* Acceleration (a) = (Final Velocity (vf) - Initial Velocity (vi)) / Time (t)

Applying the Formula

1. Identify the given information:

* Initial Velocity (vi) = 25 m/s

* Final Velocity (vf) = 10 m/s

* Time (t) = 240 s

2. Plug the values into the formula:

* a = (10 m/s - 25 m/s) / 240 s

3. Calculate the acceleration:

* a = -15 m/s / 240 s

* a = -0.0625 m/s²

Interpretation

The acceleration of the train is -0.0625 m/s². The negative sign indicates that the train is decelerating (slowing down).